I've read all the terrible reviews; I wasn't expecting much, especially since I'm unlikely to get any British humor (being in the US and growing up in Asia). But the movie really surprised me at how many times it made me laugh out loud.
The performances are great fun to watch. Yes, the characters are cliché and very 1-D, but they are played with enough enthusiasm and charm to make up for the 'weak' script. There are places where the movie falls on the 'wrong/bad' side of cringe-worthy, like some scenes with Herbie(the manager) and Stan (the best friend), but overall, it's an enjoyable way to spend two hours.
And then, there's Jimmy (Orlando Bloom's character), who with his naivete and haplessness, manages to 'preach' without ever sounding preachy or cheesy. I know this is no Oscar movie, but it isn't as mindless as some comedies out there. At its heart, spoken through Jimmy's dad's quotes, are some good really messages. It's almost a shame that the movie isn't cut for a younger audience. It'd be a good diversion from the usual 'teen queen' movies flooding the cinemas these days.